/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.idfactory;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Logger;

import net.sf.l2j.Config;
import net.sf.l2j.database.L2DatabaseFactory;

/**
 * This class ...
 * 
 * @version $Revision: 1.3.2.1.2.7 $ $Date: 2005/04/11 10:06:12 $
 */
public abstract class IdFactory {
	private static Logger _log = Logger.getLogger(IdFactory.class.getName());
	protected static final String[] ID_UPDATES = {
			"UPDATE items                 SET owner_id = ?    WHERE owner_id = ?",
			"UPDATE items                 SET object_id = ?   WHERE object_id = ?",
			"UPDATE character_quests      SET char_id = ?     WHERE char_id = ?",
			"UPDATE character_friends     SET char_id = ?     WHERE char_id = ?",
			"UPDATE character_friends     SET friend_id = ?   WHERE friend_id = ?",
			"UPDATE character_hennas      SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE character_recipebook  SET char_id = ?     WHERE char_id = ?",
			"UPDATE character_shortcuts   SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE character_shortcuts   SET shortcut_id = ? WHERE shortcut_id = ? AND type = 1", // items
			"UPDATE character_macroses    SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE character_skills      SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE character_skills_save SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE character_subclasses  SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE characters            SET obj_Id = ?      WHERE obj_Id = ?",
			"UPDATE characters            SET clanid = ?      WHERE clanid = ?",
			"UPDATE clan_data             SET clan_id = ?     WHERE clan_id = ?",
			"UPDATE siege_clans           SET clan_id = ?     WHERE clan_id = ?",
			"UPDATE clan_data             SET ally_id = ?     WHERE ally_id = ?",
			"UPDATE clan_data             SET leader_id = ?   WHERE leader_id = ?",
			"UPDATE pets                  SET item_obj_id = ? WHERE item_obj_id = ?",
			"UPDATE character_hennas     SET char_obj_id = ? WHERE char_obj_id = ?",
			"UPDATE itemsonground         SET object_id = ?   WHERE object_id = ?",
			"UPDATE auction_bid          SET bidderId = ?      WHERE bidderId = ?",
			"UPDATE auction_watch        SET charObjId = ?     WHERE charObjId = ?",
			"UPDATE clanhall             SET ownerId = ?       WHERE ownerId = ?" };
	protected static final String[] ID_CHECKS = {
			"SELECT owner_id    FROM items                 WHERE object_id >= ?   AND object_id < ?",
			"SELECT object_id   FROM items                 WHERE object_id >= ?   AND object_id < ?",
			"SELECT char_id     FROM character_quests      WHERE char_id >= ?     AND char_id < ?",
			"SELECT char_id     FROM character_friends     WHERE char_id >= ?     AND char_id < ?",
			"SELECT char_id     FROM character_friends     WHERE friend_id >= ?   AND friend_id < ?",
			"SELECT char_obj_id FROM character_hennas      WHERE char_obj_id >= ? AND char_obj_id < ?",
			"SELECT char_id     FROM character_recipebook  WHERE char_id >= ?     AND char_id < ?",
			"SELECT char_obj_id FROM character_shortcuts   WHERE char_obj_id >= ? AND char_obj_id < ?",
			"SELECT char_obj_id FROM character_macroses    WHERE char_obj_id >= ? AND char_obj_id < ?",
			"SELECT char_obj_id FROM character_skills      WHERE char_obj_id >= ? AND char_obj_id < ?",
			"SELECT char_obj_id FROM character_skills_save WHERE char_obj_id >= ? AND char_obj_id < ?",
			"SELECT char_obj_id FROM character_subclasses  WHERE char_obj_id >= ? AND char_obj_id < ?",
			"SELECT obj_Id      FROM characters            WHERE obj_Id >= ?      AND obj_Id < ?",
			"SELECT clanid      FROM characters            WHERE clanid >= ?      AND clanid < ?",
			"SELECT clan_id     FROM clan_data             WHERE clan_id >= ?     AND clan_id < ?",
			"SELECT clan_id     FROM siege_clans           WHERE clan_id >= ?     AND clan_id < ?",
			"SELECT ally_id     FROM clan_data             WHERE ally_id >= ?     AND ally_id < ?",
			"SELECT leader_id   FROM clan_data             WHERE leader_id >= ?   AND leader_id < ?",
			"SELECT item_obj_id FROM pets                  WHERE item_obj_id >= ? AND item_obj_id < ?",
			"SELECT object_id   FROM itemsonground        WHERE object_id >= ?   AND object_id < ?" };
	protected boolean _initialized;
	public static final int FIRST_OID = 0x10000000;
	public static final int LAST_OID = 0x7FFFFFFF;
	public static final int FREE_OBJECT_ID_SIZE = LAST_OID - FIRST_OID;
	protected static IdFactory _instance = null;

	protected IdFactory() {
		setAllCharacterOffline();
		cleanUpDB();
	}

	static {
		switch (Config.IDFACTORY_TYPE) {
		case Compaction:
			_instance = new CompactionIDFactory();
			break;
		case BitSet:
			_instance = new BitSetIDFactory();
			break;
		case Stack:
			_instance = new StackIDFactory();
			break;
		}
	}

	/**
	 * Sets all character offline
	 */
	private void setAllCharacterOffline() {
		java.sql.Connection con2 = null;
		try {
			con2 = L2DatabaseFactory.getInstance().getConnection();
			Statement s2 = con2.createStatement();
			s2.executeUpdate("update characters set online=0");
			_log.info("Updated characters online status.");
			s2.close();
		} catch (SQLException e) {
		} finally {
			try {
				con2.close();
			} catch (Exception e) {
			}
		}
	}

	/**
	 * Cleans up Database
	 */
	private void cleanUpDB() {
		java.sql.Connection conn = null;
		try {
			int cleanCount = 0;
			int saveCount = 0;
			conn = L2DatabaseFactory.getInstance().getConnection();
			Statement stmt = conn.createStatement();
			// Try to save pet's items
			saveCount += stmt
					.executeUpdate("UPDATE items i, pets_objects p SET i.owner_id = p.ownerId, i.loc = 'INVENTORY', i.loc_data = 0 WHERE i.owner_id = p.petId AND (i.loc = 'PET' OR i.loc = 'PET_EQUIP')");
			stmt.executeUpdate("DELETE FROM pets_objects WHERE 1=1");
			// Character related
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_friends WHERE character_friends.char_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_hennas WHERE character_hennas.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_macroses WHERE character_macroses.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_quests WHERE character_quests.char_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_recipebook WHERE character_recipebook.char_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_shortcuts WHERE character_shortcuts.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_skills WHERE character_skills.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_skills_save WHERE character_skills_save.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM character_subclasses WHERE character_subclasses.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM cursed_weapons WHERE cursed_weapons.playerId NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM heroes WHERE heroes.char_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM olympiad_nobles WHERE olympiad_nobles.char_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM pets WHERE pets.item_obj_id NOT IN (SELECT object_id FROM items);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM seven_signs WHERE seven_signs.char_obj_id NOT IN (SELECT obj_Id FROM characters);");
			// Auction
			cleanCount += stmt
					.executeUpdate("DELETE FROM auction WHERE auction.id IN (SELECT id FROM clanhall WHERE ownerId <> 0);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM auction_bid WHERE auctionId IN (SELECT id FROM clanhall WHERE ownerId <> 0)");
			// Clan related
			stmt.executeUpdate("UPDATE clan_data SET auction_bid_at = 0 WHERE auction_bid_at NOT IN (SELECT auctionId FROM auction_bid);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clan_data WHERE clan_data.leader_id NOT IN (SELECT obj_Id FROM characters);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM auction_bid WHERE auction_bid.bidderId NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clanhall_functions WHERE clanhall_functions.hall_id NOT IN (SELECT id FROM clanhall WHERE ownerId <> 0);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clan_privs WHERE clan_privs.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clan_skills WHERE clan_skills.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clan_subpledges WHERE clan_subpledges.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clan_wars WHERE clan_wars.clan1 NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM clan_wars WHERE clan_wars.clan2 NOT IN (SELECT clan_id FROM clan_data);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM siege_clans WHERE siege_clans.clan_id NOT IN (SELECT clan_id FROM clan_data);");
			stmt.executeUpdate("UPDATE castle SET taxpercent=0 WHERE castle.id NOT IN (SELECT hasCastle FROM clan_data);");
			// Character & clan related
			cleanCount += stmt
					.executeUpdate("DELETE FROM items WHERE items.owner_id NOT IN (SELECT obj_Id FROM characters) AND items.owner_id NOT IN (SELECT clan_id FROM clan_data);");
			stmt.executeUpdate("UPDATE characters SET clanid=0 WHERE characters.clanid NOT IN (SELECT clan_id FROM clan_data);");
			// Forum related
			cleanCount += stmt
					.executeUpdate("DELETE FROM forums WHERE forums.forum_owner_id NOT IN (SELECT clan_id FROM clan_data) AND forums.forum_parent=2;");
			cleanCount += stmt
					.executeUpdate("DELETE FROM topic WHERE topic.topic_forum_id NOT IN (SELECT forum_id FROM forums);");
			cleanCount += stmt
					.executeUpdate("DELETE FROM posts WHERE posts.post_forum_id NOT IN (SELECT forum_id FROM forums);");
			stmt.close();
			_log.info("Restored " + saveCount + " elements.");
			_log.info("Cleaned  " + cleanCount + " elements from database.");
		} catch (SQLException e) {
		} finally {
			try {
				conn.close();
			} catch (Exception e) {
			}
		}
	}

	/**
	 * @param con
	 * @return
	 * @throws SQLException
	 */
	protected int[] extractUsedObjectIDTable() throws SQLException {
		java.sql.Connection con = null;
		try {
			con = L2DatabaseFactory.getInstance().getConnection();
			// create a temporary table
			Statement s = con.createStatement();
			try {
				s.executeUpdate("drop table temporaryObjectTable");
			} catch (SQLException e) {
			}
			s.executeUpdate("delete from itemsonground where object_id in (select object_id from items)");
			s.executeUpdate("create table temporaryObjectTable"
					+ " (object_id int NOT NULL PRIMARY KEY)");
			s.executeUpdate("insert into temporaryObjectTable (object_id)"
					+ " select obj_id from characters");
			s.executeUpdate("insert into temporaryObjectTable (object_id)"
					+ " select object_id from items");
			s.executeUpdate("insert into temporaryObjectTable (object_id)"
					+ " select clan_id from clan_data");
			// s.executeUpdate("insert into temporaryObjectTable
			// (object_id)" +
			// " select crest_id from clan_data where crest_id > 0");
			s.executeUpdate("insert into temporaryObjectTable (object_id)"
					+ " select object_id from itemsonground");
			ResultSet result = s
					.executeQuery("select count(object_id) from temporaryObjectTable");
			result.next();
			int size = result.getInt(1);
			int[] tmp_obj_ids = new int[size];
			// System.out.println("tmp table size: " + tmp_obj_ids.length);
			result.close();
			result = s
					.executeQuery("select object_id from temporaryObjectTable ORDER BY object_id");
			int idx = 0;
			while (result.next())
				tmp_obj_ids[idx++] = result.getInt(1);
			result.close();
			s.close();
			return tmp_obj_ids;
		} finally {
			try {
				con.close();
			} catch (Exception e) {
			}
		}
	}

	public boolean isInitialized() {
		return _initialized;
	}

	public static IdFactory getInstance() {
		return _instance;
	}

	public abstract int getNextId();

	/**
	 * return a used Object ID back to the pool
	 * 
	 * @param object
	 *            ID
	 */
	public abstract void releaseId(int id);

	public abstract int size();
}
